absent-minded

Từ điển Oxford Advanced Learner 8th

ˌabsent-ˈminded [absent-minded absent-mindedly absent-mindedness] BrE NAmE adjective
tending to forget things, perhaps because you are not thinking about what is around you, but about sth else
Syn: ↑forgetful
•Grandpa's becoming quite absent-minded.
Derived Words: ↑absent-mindedly ▪ ↑absent-mindedness

Example Bank:
•an absent-minded professor/scientist